Ravens’ safety Haruki Nakamura could miss at least a month after suffering a right knee injury Sunday in the team’s 37-7 win in St. Louis.

Nakamura, who suffered the injury on a punt return in the first quarter, did not return to the game. After the game, he did not need crutches to maneuver through the locker room at the Edward Jones Dome, but he was moving very gingerly.

(Credits: Nick Wass, Associated Press)

The injury couldn’t have come at a worse time for the Ravens. The loss of Nakamura adds to a secondary that has just been decimated by the injury bug. Rookie cornerback Jimmy Smith won’t return until at least week six at best, as continues to be bothered by a high left ankle sprain. Meanwhile, veteran cornerback Domonique Foxworth did not play Sunday because of continued pain in his surgically repaired ACL.

However, Chris Carr did return Sunday after a re-aggravated left hamstring forced him to miss week two’s game in Tennessee.

Head Coach John Harbaugh said the team is not looking for a safety to replace Nakamura, according to the Baltimore Sun:

“We’ll be talking about that,” Harbaugh said. “I think we’re OK with the guys that we have. Chris Carr can go back there for a swing at safety, [cornerback] Lardarius [Webb] can go back, those guys you play in the slot. I don’t think we have a plan today to make a move, but that could change.”